GSC Sentinel-2 PDGS OCD - Emits - ESA

GSC Sentinel-2 PDGS OCD
Issue 1 Revision 2 (draft) - 25.07.2010
GMES-GSEG-EOPG-TN-09-0008
page 61 of 350
In complement, the 230Mbps repatriation capability will be used for an equivalent daily
throughput of about 74Mbps to bring the data acquired at polar-stations to processing
centres located throughout Europe and closer to the data consumers, still taking
advantage of the multicast capability to provide for flexibility and reliability through
redundancy, and possibly in near-real-time.
○ Broadcast Data-Dissemination
EDRS dissemination capabilities via broadcast will be used to transmit final products to
end users, in particular the ones that cannot be served efficiently through groundnetworks.
To this end, the usage of C-Band instead of Ka-Band or Ku-Band would be
preferred to enlarge the downlink coverage of the dissemination service beyond
Europe such as to reach some African or Middle-East regions.
Concerning data-relay communications, it is here considered that, provided OCP usage is not
constrained, contacts through EDRS will provide the right complement to polar-station
downlinks at nearly every orbit. Figure 3-7 extracted from [RD-19] (OCP Scenario 3C as bestcase)
depicts a typical day of the Sentinel-2 repeat cycle showing in light-blue the visibility
segments of OCP and in dark-blue the ones provided through X-Band to Kiruna or Svalbard
stations (Maspalomas and Prince-Albert have been artificially masked-out in light grey in the
image).
It shows that apart from the second orbit in the day (or third depending on the day) which is
poorly served through EDRS, all other orbits provide long contact segments outside of X-
Band visibilities providing for the adequate complement with the required flexibility for EDRS
usage among Sentinels.
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